Lifting-jack.



A. PETELER.

LIFYTING JACK. APPucATloN FILED luLY 26.1915..

l .,Q, Patented Oct. 24, 1916.

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A. PETELER.-

LIFTING JACK.

APPLICATION FILED JULY 26. :9 15.

Patented Oct. 24, 1916.

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A. PETELER.

LIFTING JACK.

Patented Oct. 24, IQIIS.

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APPLICATION FILED ,IULY 26,191.5.

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ADOLIPH PETELER, 0F YONKERS, NEW YORK.

LIFTING-JACK.

moaned Application filed July 26, 1915.

To all Iwhom t may concern.'

Be it known that I, ADoLrrr PETELER, a citizen of the United States, residing at No. Van Cortlandt Park avenue, in Yonkers, Vestchester county, State of New York, have invented certain new and useful Improvements in Lifting-Jacks, fully described and represented in the following specification and the accompanying drawings, forming a part 0f the same.

This invention relates to a lifting jack, the parts of which may be made chiefiy of sheet metal and thus stamped very cheaply into the required form.

The invention embraces numerous details of construction, which will be hereinafter pointed out and specified in the claims.

rl'he invention will be understood by reference to the annexed drawing in which Figure 1 is a side elevation of the jack with the nearer half of the casing removed, and the upper part of the pawl and detent broken away to expose the operative ends of the sliding spreaders; Fig. 2 is a plan in section on line 2 2 in Fig. 3; Fig. 3 is a plan of the pawl and detent; Fig. l is a side elevation of the pawl; Fig. 5 is a plan of the pawl-lever; Fig. 6 is a side view of the joint at the top of the casing, with the clamping ferrule in section; Figs. 7 and 8 are diagrams showing the position of the parts in raising the lifter-bar; Fig. 9 is a side elevation of the complete jack; Fig. 1() shows an edge view with the casing in section on line :nin Fig. 1 and some of the inner parts broken away to expose other parts; and Figs. 11 to 1a1 inclusive are diagrams showing the different positions of the parts in loweringthe lifter-bar; Fig. 15 is a diagram showing the position of the parts when the lifting bar is free to move up or down; Fig. 16 is a plan of the lower guide f; Fig. 17 is a side view of the dog fw Fig. 18 is a plan of the guide and dog; and Fig. 19 is an eleration of the guide and dog.

The casing is formed of two sheetmetal shells or side-sections a and a having their edges flanged inwardly'to the vertical center line of the jack, and secured together by connection with a foot b, by tenons c upon inner guide for the lifter-bar, and by a clamping ferrule d at the top of the casing.

Eaclrhalt of .the casing has tenons b fitted Specication of Letters Eatent.

Patented Uct. 2d, 19.119116.

serial No. 41.815. f

tofm'ortises in the foot 7) and riveted therein. The upper end of the casing is formed with a circular bore to fit the lifter-bar A, which is round, and formed with beveled rings at regular intervals, to form continuous rackteethall around its circumference. rlhe upper part of the casing is shown with a contracted neck, within the lower part of which a guide ring f is secured to guide the lifterbar in a vertical path. rlhe guide ring is secured to the opposite sides of the casing by the tenons c riveted in mortises and thus holding the opposite sides of the casing to gether.

rlhe contiguous edges of the casing at its upper end are provided each with a tongue e and a corresponding notch c to which it is fitted, and the casing is embraced at the top by a ferrule (l, which is pressed tightly upon the neck of the casing and holds the opposed parts firmly together'. The lifter-bar has a cylindrical body at its upper end, and a head B swiveled or clamped upon such body by means of projections B forced inwardly to engage a groove B extended around the body. rlhe head when lowered rests upon the ferrule d, and the beveled rings are formed upon the lifter-bar, from its lower end to a point next to the guide f, when the head is thus lowered.

The lifter-bar is lifted by a pawl g jointed to one end of a pawl lever, which has pivot studs j upon its opposite sides fitted to holes j in the opposite halves of the casing. The upper end of the pawl is curved, as-shown in Fig. 3, to fit the beveled rings upon the lifter-bar.

The pawl lever is formed of opposite com plemental parts which at their' inner ends are held together by the fitting of the studs j to the holes y" in the casing, and at their outer ends are shaped to forni a socket h, as shown in Figs. 1 and 2, for the application of a hand-bar /c to operate the jack; a portion of such bar being shown in Fig. 1. The outer ends are securely clamped together by an outerthimble L, which obviates the use of rivets through the two parts. The thimble is secured by projections forced into holes lo.

The fork upon the inner end of the pawl lever has studs Z adapted to fit holes in opm is jointed at its lower end upon a pin m exten ied through the walls of the casing, and is made, like the pawl g, of heavy sheet metal, stamped to form a nearly straight bar, with flanges upon its inner edges, which operate tovstiffen such bar and also furnish the journals for the pivots.

The pawl and detent are connected to the ends of abent wire spring n; such ends being fitted to holes in the flanges of the respective parts, and the body of the spring being extended downwardly from such holes and formed with a coil at the bottom to give elasticity to the spring. This spring operates to hold the pawl and detent normally in light engagement with the rings upon the lifter-bar. y

f A retracting spreader o is extended upwardly close to one side of the lifter-bar between the flanges of the pawl g, and the foot of such spreader has a lug s sustained upon a spring o. A stud 79 is secured in the base and extends upwardly through the lug and has a head to restrict the upward movement of the spreader when free.

The working end of the pawl is sloped in correspondence with the bevel of the rings upon thel lifter-bar and the upper end of the spreader, when it is pressed upwardly by the spring, collides with the beveled under side of the pawl, when the pawl is lowered, and retracts the pawl from the lifter-bar. A similar spreader g is fitted to slide within the detent m and has a lug s at the bottom movable upon a stud p', the same as the lug of the spreader 0,' and is pressed normally upward by a spring o. When in its upper position, the upper end of the spreader g lies flush with the top of the detent, and prevents the latter from engaging the lifterbar.

The head or operative end of both the detent and pawl is inclined as shown in Fig. 1,

to match the slope of the annular teeth upon the lifter-bar, which inclination of these heads enables them to coperate with the spreaders, as the wedging of the spreaders between the outer side of the lifter-bar and the sloping inner side of the head, upon the pawl er detent, pushes the head outwardly, and thus retracts the pawl or detent, with which it is engaged, from the lifter-bar. The slope of these heads thus performs two functions, as it affords a full engagement of the pawl or detent with the teeth upon the lifter-bar, and also furnishes the sloping surface upon which the spreader can op' erate. Y

When the two spreaders are raised and the pawl depressed, the lifter-bar may be raised and lowered freelv without anv obstruction, as shown in Fig. l5. It will be observed thatthe beveled form of the rings or rack-teeth Vupon the lifter-bar automatically fcauses the retraction of the .detent from the rack-teeth when the lifter-bar is raised. This form of the teeth also permits the pawl and detent to slide gradually into the spaces between the teeth when the lifter-bar is lowered.

The two spreaders are held downward, iu their inoperative position shown in Fig. l, by means of a reversing agent which is adapted to hold the two spreaders in an inoperative position, or to permit them to operate normally. rThis reverser 1 is movable toward and from the lugs upon the spreaders, and has a slot litted to two studs '2" within one slide of the casing and the rcverser is provided with ears s', which project over the upper sides of the lugs s upon the two spreaders, and hold the lugs and spreaders downward as shown in Fig. l, in opposition to the springs o. A slot t with enlarged ends 2." is shown in the casing above the studs 1, and a flexible portion u is projected upward from the reverser, above thc studs r, and provided with `a button u for moving the reverser. The shank of the button is fitted to move through the slot t and it has a thin collar o fitted detachably to the ends of the slot. (See Fig. l0.) lVith this construction the pushing inward of the knob bends the leaf u inward sufficiently to clear the collar o from the ends of the slot, which permits the shank of the button to move freely in the slot and thus raise or lower the slide 11.

It will be observed that the pawl-lever and the detent are both journaled upon the casing and the pawl and detent can thus be fully` adjusted in relation to one another before the casing is secured upon the base.

The base Z) is flanged downwardly on its edges to retain a wooden block Z2', and a flanged sheet-metal socket Zi is fitted in the center of the block, and the flange on its up` per edge is sunk into the top of the block, in which it is clamped when the block is pressed into the base. The socket is of size to admit the lower end of the lifter-bar` as shown in Fig. l, and thus permits a greater movement of the lifter-bar; while it also prevents the lifter-bar from dropping out of the casing at the bottom.

The lifter-bar is necked at the bottom to form a collar w and a dog w is secured within the casing near the guide f and held by a spring wg in position to engage the collar e0 when the lifter-bar is wholly lifted; and the lifter-bars movement is thus limited in yan upward direction. The dog 'w is mounted movably upon a. neck c formed at the side of one of the tenons c upon the guide f, and the guide is also formed with shoulders c at the bases of the tenons against which the casing sections are tightly drawn when the tenons are riveted in their mortises. The dog lw has hooks w which hold .it loosely upon the neck, so that the spring Lacanau m w can press it toward the lifter-bar. The relation of the dog to the guide is shown in Figs. 18 and 19.

The spreaders are engaged movably with one another b y a wing upon one of the spreaders, having a vertical slot af therein,

and a corresponding wing mi upon the other spreader, having` a tongue y movable lengthwise in such slot, about tie saine amount as the lugs s are movable upon the studs p and ji. rlhe wings are curved to lit the circular sides oi the lifter-bar, as shown in Fig. 2, and the spreader-s are thus guided accurately in a line with the litter-bar, when they are tree to move.

The operation of the mechanism is as tollows: in raising` the li'terbar, both of the retracting spreaders are locked in their lower position shown in Fig. 1, and the detent thus takes the load whenever the teeth are raised by the engagement or' the pawl. Fig. 'i' shows the pawl raising the load and the lifter-bar lifted so that the detent engages a tooth. Fig. S shows the pawl lowered, while the load is carried by the detcnt. ln lowering the lifter-bar, the spreaders are released by raising the slide fr, so that the spreader g may press elastically against the sloping head of the detent, and retract the same, when free from load, as in Fig. 11. r-"is the pawl moves downward with the load, its spreader 0 is pushed down by the pawl, as in Fig. 11, and the engagement of the wings 0;', tu upon the spreaders, carries the spreader f/ with it, so that the detent may engage the rack, and take the load from the pawl, when lowered one space, as shown in F ig. 12. A lslight lowering of the pawl after the detent has taken the load, permits the spreader o to spring upward and retract the pawl. as in Fig. 13, so that the pawl may be raised again, as shown in Fig. 14. A slight littinn of the pawl by the pawl-lever raises the lifter-bar from the detent and permits its spreader to retract it as in Fig. 11, when the lifter-bar can be lowered another step.

By making the lifter-bar of a round bar, the teeth of the rack can be more cheaply made than the straight rack teeth, and the lifter-bar is adapted to swivel into any position.

The connections for the casing halves avoid the use of bolts or rivets, as also those of the twc-part pawl lever, and the journaling of the pawl lever and the detent directly upon the casing obviate the need of making the base with journal-bearings. rl`he other constructive features produce a very economical construction.

`Wh at I claim and desire to secure by Letters Patent is:

1. ln ay lifting jack, the combination, with a. casing` having a cylindrical guide, of a round lifter-bar having annular teeth and ing their heads ot 'the sais fitted rotatably to the guide so as to swivel therein when carrying its load. the lifter.- bar having a collar upon yits lower end, and a dog upon the casing arranged to engage the collar when the litter-bar is wholly lifted, an d to prevent any further upward movenient thereof, and a par, and detent operating upon the annular ot the lifter-- bar t'or raising the saine.

2. ln a lifting jacli, the combination. with a casing having` a cylind ical y of a round lifter-bar i'itted to such guide and having annular teeth wholly bei`Y their outer sides. a pawl id a i the teeth, sprea ders ino-.rated to side between` the lit'tei 'bar and the said pawi and detent and having their upper ends adapted to press upon the respective inclined heads for retractini the pawl and detent from the teeth, a lug projected lfom the tout oif each spreader -with a spring to press it upward, and a reverser mounted inovaniv within one side of the casing and having ears to engage the upper sides of the lugs, to simultaneously hold both ot of the spreadersinopererative when desired.

3. A lifting jacl; having a. casing formed ot two side-sections of sheet metal with bent flanges abutting at the center line, a base plate oined to the bottoms of the sections by tenons and mortises, a cylindrical guide in the top of the ca sing, a iterrule secured upon the exterior oi the said guide for clamping the sections together at the top, and a lifter-bar iitted movably to the guide.

4. L lifting jack, having casing formed ot' two side-sections oiE sheet metal with iianges abutting at the, center line, a base plate joined to the bottoms or the sections, a cylindrical guide in the top of the sections, with tongue and notch engagement o'l' the opposed edges of the section, a iierrule secured upon the exterior oi the guide over the tongues and notches ttor clamping the sections together, and a litter-bar fitted movably to the guide.

A lifting ack, having a casing formed of' two similar side-sections with flanges abutting at the center line, a base plate joined to the bottoms of the sections, a cylindrical top guide in the upper end of the casing, with a 'ferrule fitted to the exterior of the said guide. and an auxiliary guide within the casing below the top guide, with tenons riveted through the sides of the casing, a round lifter-bar tted movably to the guide and means for lifting the lifterbar step by step.

6. ln a lifting jack, the combination, with a toothedv lifter-bar having a pawl and a detent pressed normally into its teeth, and spreaders sliding between the lii'ter-bar and the said pawl and detent, of a lug projected :from the -foot ot' each spreader, with a spring to press it upward, a reverser mounted movably Within one side of the casing and provided with a spring leaf, and having` a `button attached to the spring leaf and extended through a. slot in the casing to move the said slide, means to lock` the button in the slot when adjusted, and ears on the slide to engage the lugs.

7. A liftingjack having a casing formed of two side sections with bent flanges abutting at the center line, a base-plate joined to the bottoms of the sections, and the sections shaped to form a cylindrical guide in the top of the casing, with holesin opposite sides of such guide, and a ferrule fitted to the exterior of the guide and having bosses forced therefrom into the said holes, to retain the parts together.

8. A lifting jack having a casing, and a toothed ram with pawl and detent to operate the same, a paWl-lever formed of two similar parts pivoted at one end to the pawl, and the other ends shaped to form a round socket with holes in its opposite sides, and a thimble fitted to the exterior of the socket and having bosses forced into the Said holes to retain the parts together.

In testimony whereof I have hereunto set my hand.

ADOLPH PETELER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

